Mold for artificial stones



2 Sheets-Sheet l H. ACKERMANN MOLD FOR ARTIFICIAL STONES Filed July 10,1929 Dec. 26, 1933.

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Inventor.-

Dec. 26, 1933. H. ACKERMANN 1,941,379

MOLD FOR ARTIFICIAL STONES Filed July 10, 1929 2 Sheets-Sheet 2 E a" 6it E m I E m g n i M L/ /Z i Z 72 r z r 72 72 m H m f it a? &

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@i f z Patented Dec. 26, 1933 UNITED STATES PATENT OFFIQE MOLD FORARTIFICIAL STONES Hugo Ackermann, Godesberg-on-the-Rhine, Germany 2Claims.

My present invention relates to a molding device suitable for makingartificial stones and provided with an appliance intended for adjustingthe distance of the parts of mold walls so that the adjusting appliancepermits of a modification of the size of the molding space, on one hand,and of the molding walls being detached from the object molded, on theother hand.

The principal object of the invention is that all parts of the mold,consisting only of four walls and having means adapted to displace thewalls of the mold in opposite directions are arranged inside arectangular rigid frame which can be lifted and turned by means oftrunnions.

A further object of the invention is to arrange all parts of the moldingdevice in the rigid frame in such manner that in each direction to thetop and the bottom the space between the four walls of the mold remainswholly free. In this case one side of the molding openings may bedeposited during the forming process on an auxiliary bottom plate andafter working the mold may be lifted and swung out together with thisauxiliary bottom plate and the object molded may be deposited on anotherauxiliary bottom plate for drying.

A further object of the invention consists in that the displacement ofone pair of walls of the mold simultaneously in opposite directionscauses a corresponding displacement of the other pair of walls so thatthe walls being displaced by pairs parallel to each other and thereforea favorable detachment from the object molded can be arrived.

Referring to the accompanying drawings:

Fig. 1 is a plan view of the mold in the closed condition partly insection.

Fig. 2 is a plan view of the same molding device also in the closedcondition and partly in section but arranged for tamping artificialstones of smaller size.

The rectangular rigid frame consists of the heads a and b and bothparallel sides 0 which are round rods, preferably. With the designsaccording to Figs. 1 and 2 three cross beams d, e, I slide on theparallel sides 0. On the inner face of the outside cross beam f and onthe face to the latter opposed of the central cross beam e the end wallsZ of the tamping mold are fixed removably.

with the free outside cross beam d by means of tance of the outsidecross beams and thus also The outside cross beam ,1 is yoke-like coupledof the cross beams and e carrying both end walls Z, Z can be modified.In this way the distance of the end walls I can be adapted to the lengthgiven of the object to be molded in a simple and safe manner.

In the instance of execution of the displacing appliance of the tampingmold as shown in Figs. 1 and 2 the opposite movement of the end wallsintended for detaching the same from the object molded is e. g.accomplished by a screw 2' with left and right-handed threads. The screw2' is pivotally but not slidably mounted on the head a of the carryingframe arranged by the side of the free outside cross beam d. It isprovided with a thick right-handed thread and further with a thinnerleft-handed thread. These threads are in engagement with female threadsof corresponding sizes which are provided for in the free outside crossbeam 11 and in the central cross beam e respectively. When the screw isbeing turned by means of a hand wheel is the cross beams d and e and, onaccount of the outside cross beams d and I being coupled with eachother, also the cross beams e and f carrying the end walls I aredisplaced in opposite directions. In the design shown the left-handrotation of the screw i withdraws the end walls from each other whereasby the right-hand rotation of the screw i the mold is being closedagain.

The very point of importance of the invention consists in that all partsof the mold are arranged within the rectangular rigid frame a, b, c insuch manner that in each direction the space between the four walls I,Z, 0, o of the mold remains wholly free, the frame being easily movabletogether with the mold and its displacing appliance for instance bybeing suspended on a carrier by means of the trunnions z with which theheads a and b of the frame are provided.

The design of the displacing appliance is not essential to the executionof the invention itself. The very point of importance consists in thatthe carrying frame of the mold is provided with a gear suitable forproducing a movement in opposite directions of the cross beams e and Icarrying the end walls I, by aid of a third cross beam (1 added.

In order that the displacement in opposite directions of the cross beamse and f carrying the end walls I may also cause a movement in oppo- .105site directions of the side walls 0. the cross beams e and f areprovided with two wedges m with internal taper which wedges are slidableon the beams referred to and to be fixed by clamping screws m. Thedistance of both wedges m fastened to a cross beam depends on theclearance of the side walls 0, o of the mold in turn determined by thewidth desired of the object to be molded. Against the tapered surfacesof the wedges m there are pressed from within by the springs r, 1-having an initial tension the wedges n, n fastened to either side of theside walls 0 of the mold the pressure acting on their outside taper. Theside walls 0 are guided by guides q fastened to the sides 0 of thecarrying frame.

When the mold is being opened the cross beams e and I with the end wallsZ, Z and the wedges m, m fastened to them are displaced outwards inopposite directions by the lateral gear of the displacing appliancebeing actuated and so cause the wedges m and n to slide on each otherwhile the springs 1' press the wedges n, n with the side walls 0, 0fastened to outwards as much as the clearance of the wedge surfacespermits.

When the mold is being closed the wedges m press the wedges n with theside walls attached inwards against the pressure of the springs r untilthe size set of the molding space has been restored.

Having thus described claim is- 1. A molding device for tampingartificial stones, comprising a rectangular rigid frame having trunnionsadapted to lift and turn the said frame, a pair of moldend-walls-supporting cross beams slidably mounted on the side members ofsaid frame, a mold composed of a pair of side walls slidably supportedby the side members of said frame and a pair of end walls respectivelymounted on and supported by said cross-beams respectively to movetherewith, a third crossbeam slidably mounted on said side members,

my invention, what I means connecting said third cross-beam and the mostdistant cross-beam of said pair to cause them to move together in thesame direction, and means engaging said third cross-beam and the mostadjacent cross-beam of said pair to cause them to move simultaneously inopposite directions.

2. A molding device for tamping artificial stones, comprising arectangular rigid frame having trunnions adapted to lift and turn thesaid frame, a pair of mold end walls supporting cross beams slidablymounted on the side members of said frame, a mold composed of a pair ofside walls slidablysupported by the side members of said frame and apair of end walls respectively mounted on and supported by saidcross-beams respectively to move therewith, wedge members respectivelymounted on the outer end portions -of the respective side walls andhaving outer oppositely presented tapering surfaces, pairs of wedgeblocks adjustably mounted on the said respective cross-beams and havingtapering surfaces so positioned as to respectively engage and cooperatewith the corresponding tapering surfaces of said wedge members, springsrespectively pressing said wedge members toward the respectivecooperating wedge blocks, a third cross-beam slidably mounted on saidside members, means connecting said third cross-beam and the mostdistant cross-beam of said pair to cause them to move together in thesame direction, and means engaging said third cross-beam and the mostadjacent cross-beam of said pair to cause them to move simultaneously inopposite directions.

HUGO ACKERMANN.

